Metal coating.



GUILLIAM H. CLAMER, OF PHILADELPHIA, PENNSYLVANIA.

METAL COATING.

Specification of Letters Patent.

Patented Jan. 19, 1909.

Application filed October 28, 1908. Serial No. 459,842.

To all whom "it may concern:

Be it known that I, GUILLIAM H.'CLAMER,

a citizen of the United States, residing at" the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania,

have invented certain new and useful Imrovements in Metal Coating, of which the ollowing is a specification.

The object of the present invention is to provide a metal, such as iron or the like, with a coating of zinc and an exterior coating substantially of lead which coatings shall be relatively free from pin-holes and shall protect against corrosive and other like actions.

The product comprises metal, as iron, having a zinc coating or being galvanized as it is called, and also having an additional lead coating with or withouttin and containing zinc to within its saturation point. In'thc manufacture of this product the zinc coated or galvanized iron in sheet, wire or other form, is treated by immersion in a fused bath of, for example, chlorid of zinc or chlorid of zinc and sal-ammoniac and then passed througha bath'of molten lead with or-w'ithout tin and containing zinc to within its saturation point. In as much as the lead bath contains zinc to substantially its saturation point, this bath does not rob the iron which passes through it of any of its zinc coating. In this wa perfect coatings of zinc and of substantial y lead (although the latter contains zinc to within'the point of saturation and may or may not contain tin) are obtained with certainty and at all times. 1% of zinc by weight is an example of about the weight which will saturate a lead bath containing up to 4% of tin. If the tin is reduced the zinc may also be redmed. The pointis that the lead b'ath-or. lead tin bath should be so saturated with zinc as not to rob the zinc coated or galvanized articles which are passed through it of the zinc of their coating. The melting point of zinc is higher than that of the perfectly liquid lead zinc bath. For example, the former is about 780 F., and the latter may be under 700 F., for example, 650 F., but although the melting point of zinc is higher than that of the perfectly liquid lead bath, still the latter unless saturated as described with zinc would absorb or dissolve zinc from the coating of the articles that are passed through it.

- What I claim is:

1. Galvanized iron provided with a coating of lead and zinc and not to exceed 4% by weight of tin, substantially as described.

2. The process of coating metal as iron which consists in coating it with zinc and afterward with lead containing zinc up to the saturation point, substantially as described.

3.-The process of coating metal as iron which consists in coating it with zinc and afterward with lead containing zinc up to the saturation point, and tin not to exceed 4% by weight, substantially as described.

In testimony whereof I have hereunto signed my name in the presence of two witnesses.

GUILLIAM H. CLAMER.

Witnesses CLIFFORD K. CASSEL, MARY MCGARVEY. 

